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Supplemental financial information - Additional Information (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Oct. 27, 2021
Sep. 30, 2021
Sep. 30, 2021
Asset Acquisition [Line Items]      
Treasury shares issued related to stock compensation (in shares)   1,064,600 6,163,997
Subsequent Event      
Asset Acquisition [Line Items]      
Cash consideration for acquisition $ 900